@Littlefx4 has it. The Flood Ford warranty is a Ford ESP, not some aftermarket warranty. The ESP may run ‘concurrent’ with your ESP. That is, you buy in December. In January you buy Flood, or someone else’s better priced ESP (good luck) for 8 years / 125k. The 8 years begins the day you bought the truck, not the 3 year anniversary of you buying the truck.
Full disclosure: I bought the Ford ESP via Flood. My local stealership knew of it the next service visit, the same week.
I believe there’s another dealer who is competitive with Flood. Sometimes they’re better, sometimes even, sometimes not - I don’t recall the name of the other well known dealer selling the Ford ESP at basically cost.